i think there is a difference between gambling and investment. if you do not want gambling you should invest bitcoin in other trading like propert dealing. to or motor bargain etc.

Gambling is also an investment, if you want to gamble then you need to invest your money first and then only you will be able to gamble, but its an really risky investment to make.

if now I have 10 BTC, I would definitely use it for business purposes such as trading or investment, maybe I will also use it to invest in the real world

I'd send those puppies into a paper wallet. Nothing wrong with holding 

it can be really good to have 10 btc  for me i can use to go abroad for it it is enough for a week olso i can use it for to excange of bitcoin and i can make more bitcoin if i use it exchange of bitcoin but really i will choose to go aboad for to use 10 btc because when i listen mysel i understand i need to good vacation

Nice tips,,but is there any guarantee that i can turn my 10btc into 100btc by doing that?
What if the price of eth goes down? 

if i have 10 btc i would hold the 5 btc for the future and the   5 btc is for investing  because i want to increased my 5 btc and Well 10 BTC was too much for trade, I myself always use 1-2 BTC to trade. if I was given 10 BTC is now probably most of BTC was my exchange with the dollar or I would probably invest If you are giving me that than I will hold it until the value will be more so I can get more profit later in the future because the halving is also coming and that is nice. But you have also to know that you can wait a really long time until the value will be more so you need some patience for it.

Definitely holding 10 btc is really a good amount for the upcoming halving. And once the halving is done, you can just sell it out.
And possibility of earning maybe twice the present amount of it if you are going to sell that after the halving.
And instant profit you can get by it.

with 10 BTC I can do anything. A buy electronic goods. bought all the daily needs. the current price of bitcoin is very high and I feel lucky to have saved some of the bitcoin in my wallet.

If you are planing to hold it for  more years then I suggest you don't, you don't need to hold them for so long. the bitcoin halving is just one month away, and you can sell your bitcoin that time and get a grand profit.. I don't know when will be another halving. or may be there won't be another halving again. so this is the best time for sale. I will sell for sure.